Published by Futura Publications in 1977, this was the fifth New Avengers
paperback. It was published in the USA by our good friends at Berkeley
Medallion. The story is based on the screenplay for the TV episode, The
Last Of The Cybernauts...?, which was written by Brian Clemens. The book
is called The Cybernauts on the cover, and Last of the Cybernauts on the title
page. There was also a hardcover edition of this published in the UK.

From the back cover of the UK edition:
THE CYBERNAUTS

Cumbersome, colossal and deadly, they were metal
robots emerging from a past everyone had believed dead: controlled by a man
whose horrible mutilations in a car accident had turned him into a monster, half
flesh, half machine.

This is the enemy the Avengers, Steed, Purdey,
and Gambit have to face when they discover that Professor Mason, Britain's
leading expert on cybernetics has been forcibly abducted from one of the
most heavily guarded security establishments in the country.